COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

If the flow of air through the compressor is perpendicular to its axis, then it is a

Axial flow compressor

Reciprocating compressor

Centrifugal compressor

Turbo compressor

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In the aircraft propellers

Propulsive matter is ejected from within the propelled body

All of these

The propulsive matter is caused to flow around the propelled body

Its functioning does not depend on presence of air

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Clearance volume in actual reciprocating compressors is essential

To accommodate Valves in the cylinder head

To attain high volumetric efficiency

To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

To provide cushioning effect

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The efficiency of a jet engine is higher at

Low speeds

High speeds

Low altitudes

High altitudes

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In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during

None of these

Isentropic compression

Isothermal compression

Polytropic compression

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The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

Increase first at fast rate and then slow

Increase first at slow rate and then fast

Decrease continuously

First increase, reach maximum and then decrease

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In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into

Vacuum

Back to the compressor

Discharge nozzle

Atmosphere

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Work ratio of a gas turbine may be improved by

Decreasing the compression work

Increasing the turbine work

Both (A) and (C) above

Increasing the compression work

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Reciprocating air compressor is best suited for

Large quantity of air at high pressure

Small quantity of air at low pressure

Small quantity of air at high pressure

Large quantity of air at low pressure

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Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on

Change in load

Mass flow rate

Stagnation pressure at the outlet

Pressure ratio

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